Q39 of 163 Page 226

Give two differences between food chain and food web.

1) A food chain is a single path of plants and animals eating each other and transferring energy accordingly. Food web is a network of interdependent food chains.


2) A food chain shows only one string of connected plants and animals and their food habits. On the other hand, a food web shows food habit of various plants and animals in an ecosystem.


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37

We do not clean ponds or lakes but an aquarium needs to be cleaned periodically. Why?

 38

What will be the consequence of the absence of decomposers in the ecosystem?

 40

Write one or two words for each of the following statements/definitions:

(a) Each level of food chain where transfer of energy takes place


(b) The physical factors like temperature, rainfall, light, soil, air and water of an ecosystem


(c) Organisms which depend on the producers for food either directly or indirectly


(d) The physical and biological world where we live in


(e) Self-contained unit of living things and their non-living environment needing only sunlight for its functioning

 41

What is meant by biodegradable waste materials? Give two examples of biodegradable wastes.